地电阻率仪温度特性与观测日变化现象的关系分析

doi:10.12196/j.issn.1000-3274.2023.02.005

摘要/Abstract

摘要： 在进行地电阻率观测时, 部分台站的地电阻率观测数据出现日变化现象, 这种日变化现象与所处环境温度日变化相关性较好, 然而环境温度变化不仅影响浅层介质电阻率, 也可能对观测仪器有一定的影响。本文首先从理论计算和环模温度试验两方面分析了地电阻率仪电流测量取样电阻特性和地电阻率仪在温度变化时对地电阻率测值的影响情况。从温度对地电阻率观测结果影响的角度, 以青海拦隆口台站为例分析了地电阻率实际观测中存在的日变化现象, 利用地电阻率仪温度特性对拦隆口台站进行温度校正, 去除观测主机对测量结果的影响。校正后地电阻率测量结果仅变化0.03%, 与该台站0.25%日变化幅度相比影响极小, 表明地电阻率仪随温度的变化不是造成地电阻率日变化的主要因素, 为今后研究地电阻率日变化的原因分析提供了参考依据。

关键词: 地电阻率观测, 温度特性, 日变化, 取样电阻

Abstract: In the geo-electrical resistivity observations, at some stations have a diurnal variation phenomenon, which has a good correlation with the diurnal variation of ambient temperature. However, temperature variation not only affects the resistivity of shallow media, but also may have a certain impact on observation meter. This paper analyzes the influence of the sampling resistance characteristics of the current measurement of the geo-electrical resistivity meter and the influence of the geo-electrical resistivity meter on the measured value of the geo-electrical resistivity when the temperature changes from both theoretical calculations and ring model temperature experiments. From the perspective of the impact of temperature on the observation results, the diurnal variation in the actual observation of the geo-electrical resistivity station was analyzed using the Lanlongkou station, Qinghai Province as an example. The temperature characteristics of the geo-electrical resistivity meter were used at Lanlongkou station to remove the impact of temperature on the observation host. After correction, the measured result of geo-electrical resistivity only changes by 0.03%, which has a minimal impact compared to the 0.25% diurnal variation amplitude. This indicates that temperature-induced changes in the resistivity meter are not the primary factor causing diurnal variations in geo-electrical resistivity, providing a basis for future research on the causes of these variations.

Key words: Geo-electrical resistivity observation, Temperature characteristics, Diurnal variation, Sampling resistance

中图分类号:

P319.3

娄晓宇, 张宇, 张兴国, 张世中, 胡哲. 地电阻率仪温度特性与观测日变化现象的关系分析[J]. 地震, 2023, 43(2): 46-59.

LOU Xiao-yu, ZHANG Yu, ZHANG Xing-guo, ZHANG Shi-zhong, HU Zhe. Analysis of the Relationship between Temperature Characteristics of Geo-electrical Resistivity Meter and the Observed Diurnal Variation[J]. EARTHQUAKE, 2023, 43(2): 46-59.

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